{"id":"CVE-2021-36226","aliases":["EUVD-2021-22846","GHSA-wmmr-frfj-gmmw"],"status":"published","title":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade...","description":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00808,"percentile":0.57287,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2023-02-06T00:00:00Z","modified":"2026-06-17T03:58:33Z","products":[{"vendor":"westerndigital","product":"my_cloud_os"}],"references":[{"url":"https://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users/","tags":["x_transferred","Exploit","Patch","Third Party Advisory"]},{"url":"https://www.youtube.com/watch?v=vsg9YgvGBec","tags":["x_transferred","Exploit","Patch","Third Party Advisory"]},{"url":"https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.md","tags":["x_transferred","Exploit","Patch","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36226"},{"url":"https://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users"},{"url":"https://github.com/advisories/GHSA-wmmr-frfj-gmmw"}],"sources":{"cve":[{"id":"CVE-2021-36226","description":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.","status":"published","published":"2023-02-06T00:00:00Z","modified":"2025-03-26T18:39:10.299Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-22846","description":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.","status":"published","published":"2023-02-06T00:00:00Z","modified":"2025-03-26T18:39:10Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T20:52:50.922534Z"}],"ghsa":[{"id":"GHSA-wmmr-frfj-gmmw","title":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade...","description":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.","status":"published","published":"2023-02-06T15:30:24Z","modified":"2025-03-26T21:31:50Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:00:28.149554Z"}],"nvd":[{"id":"CVE-2021-36226","description":"Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.","status":"published","published":"2023-02-06T14:15:08.97Z","modified":"2026-06-17T03:58:33.26Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}